| and ?

Regex Cheat Sheet

Attention VSCode Users! You can search programs using regexes! We vim users have had this all along.

[a-zQ5&#]    list/range character class
[^a-zQ5&#]   snotty character class: anything but chars shown
m                this non-magic character is just.... m.
.                any character except \n
\s               whitespace
\S               anthing not whitespace
\d               digit
\D               non-digit
\w               any alpha character or _
\W               anything but an  alpha character or _

Magic charcters in list character classes:

[                start list character class
]                end list character class
-                indicaes a range
^                when first, makes a list character class snotty

Assertions :

^                start of line
$                end of line
\b               word boundary
\B               not word boundary

Multiplicity Operators

*                zero or more
+                one or more
{n}              exactly n of
{m, n}           at leasat m nbut not more than n of
{m,}             m or more
?                once or not at all

Operators

juxtaposition    "and then immediately"
|                or
(... )           override order of operations


Magic Toggler:

\

Example \? is a question mark, not a multiplicty operator
d is the nonmagic letter d, \d is a digit.

Java
java.util.regex package.  Note that in Java a \\ is needed for a \.

Python:
re                        the regular expression package
                          tip: use raw strings for regexes.

match an integer:    ^[+\-]?\d+$

Or example:  match these three

Amy Sheck is bonkers.
John Morrison is loony!
John Morrison is crazy



^(Amy Sheck|John Morrison) is (bonkers|loony|crazy)[!.]?$

greed. What is greed?
You might want to learn about greed
Waht is a grou?
What is capturing?


The PFM makes me want to cry.
The PFM makes me want to die!
Physics makes me want to crawl under a rock
Physics makes me want to die

^(The PFM|Physics) makes me want to (cry|die|crawl under a rock)[.!]?$

ababababababababa   (could end in a or b)

^(ab)+a?$